<!doctype html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
		<title>fengyuanbiao</title>
	</head>
	<style>
		div{
			width:100px;
			height:100px;
			
			float:left ;
			margin:8px ;
		}
		.aaa{
			background:yellow;
		}
		#dd{
			background:red;
		}
	</style>
	<body>
		<div class="aaa"></div>
		<div id="dd"></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
	</body>
</html>